v/examples/hot_code_reloading/bounce.v

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// Build this example with
// v -live bounce.v
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module main
import gx
import gl
import gg
import glfw
import time
struct Game {
mut:
vg *gg.GG
x int
y int
dy int
dx int
height int
width int
main_wnd *glfw.Window
draw_fn voidptr
}
fn main() {
glfw.init()
width := 600
height := 300
mut game := &Game{
vg: 0
dx: 2
dy: 2
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height: height
width: width
}
mut window := glfw.create_window(glfw.WinCfg {
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width: width
height: height
borderless: false
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title: 'Hot code reloading demo'
ptr: game
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always_on_top: true
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})
//window.onkeydown(key_down)
game.main_wnd = window
window.make_context_current()
gg.init()
game.vg = gg.new_context(gg.Cfg {
width: width
height: height
font_size: 20
use_ortho: true
})
println('Starting game loop...')
go game.run()
for {
gl.clear()
gl.clear_color(255, 255, 255, 255)
game.draw()
window.swap_buffers()
glfw.wait_events()
}
}
const (
W = 50
)
[live]
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fn (ctx &Game) draw() {
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ctx.vg.draw_rect(ctx.x, ctx.y, W, W, gx.rgb(255, 0, 0))
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}
fn (ctx mut Game) run() {
for {
ctx.x += ctx.dx
ctx.y += ctx.dy
if ctx.y >= ctx.height - W || ctx.y <= 0 {
ctx.dy = - ctx.dy
}
if ctx.x >= ctx.width - W || ctx.x <= 0 {
ctx.dx = - ctx.dx
}
// Refresh
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time.sleep_ms(17)
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glfw.post_empty_event()
}
}